Wiring
ASDA-A3
3-54
3
3.10.4 How does the STO function work?
The STO function controls the motor current by two individual circuits. It cuts off the power supply
to the motor when needed, after which the motor is free from torque force. When an STO alarm
occurs, determine the alarm type according to the pin status of the feedback monitor signal
(FDBK). The following table details how this function works.
Description of action and feedback status
Signal
Safety signal
source
Status of opto-isolator
STO
STO_A
~ / STO_A
ON
ON
OFF
OFF
STO_B
~ / STO_B
ON
OFF
ON
OFF
Servo drive output status
Ready
Torque off
(STO_B lost)
Torque off
(STO_A lost)
Torque off
(STO mode)
Feedback monitor signal
(FDBK status)
Open
Close
Open
Open
Alarm
N/A
AL500
AL501
AL502
Note:
1.
ON = 24V; OFF = 0V.
2.
Open = open circuit; Close = short circuit.
3.
The status of the feedback monitor signal switches immediately based on the safety signal source
changes.
4.
Contact the distributor if AL503 occurs. Refer to Chapter 13 Troubleshooting for more details.
3.10.4.1 Activation status
STO reaction time:
When one of the safety signal source is low, the circuit cuts off the motor current within 20 ms.
Max. 20 ms
ON
OFF
Motor current
STO_A / STO_B
H
L
Summary of Contents for ASDA-A3 Series
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Page 89: ...Wiring ASDA A3 3 38 3 Pin assignment for the CN1 quick connector J2 and J1 ...
Page 91: ...Wiring ASDA A3 3 40 3 Wiring for CN1 quick connector and installation Installation ...
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Page 605: ...Parameters ASDA A3 8 232 8 This page is intentionally left blank ...
Page 623: ...MODBUS Communication ASDA A3 9 18 9 This page is intentionally left blank ...
Page 645: ...Absolute System ASDA A3 10 22 10 This page is intentionally left blank ...
Page 661: ...Linear Motor ASDA A3 11 16 11 This page is intentionally left blank ...
Page 793: ...Troubleshooting ASDA A3 13 48 13 This page is intentionally left blank ...
Page 819: ...Specifications ASDA A3 A 26 A This page is intentionally left blank ...
Page 841: ...Accessories ASDA A3 B 22 B This page is intentionally left blank ...